/Engine/Source/Editor/UnrealEd/Public/Subsystems/EditorAssetSubsystem.h
Call this to remove a callback added with AddOnExtractAssetFromFile.
void RemoveOnExtractAssetFromFile ( [FOnExtractAssetFromFileDynamic](API\Editor\UnrealEd\Subsystems\UEditorAssetSubsystem\FOnExtractAssetF-) Delegate )